1 // RUN: %clang_cc1 -analyze -analyzer-checker=alpha.unix.Stream -analyzer-store region -verify %s 2 3 typedef __typeof__(sizeof(int)) size_t; 4 typedef struct _IO_FILE FILE; 5 #define SEEK_SET 0 /* Seek from beginning of file. */ 6 #define SEEK_CUR 1 /* Seek from current position. */ 7 #define SEEK_END 2 /* Seek from end of file. */ 8 extern FILE *fopen(const char *path, const char *mode); 9 extern FILE *tmpfile(void); 10 extern int fclose(FILE *fp); 11 extern size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream); 12 extern int fseek (FILE *__stream, long int __off, int __whence); 13 extern long int ftell (FILE *__stream); 14 extern void rewind (FILE *__stream); 15 16 void f1(void) { 17 FILE *p = fopen("foo", "r"); 18 char buf[1024]; 19 fread(buf, 1, 1, p); // expected-warning {{Stream pointer might be NULL}} 20 fclose(p); 21 } 22 23 void f2(void) { 24 FILE *p = fopen("foo", "r"); 25 fseek(p, 1, SEEK_SET); // expected-warning {{Stream pointer might be NULL}} 26 fclose(p); 27 } 28 29 void f3(void) { 30 FILE *p = fopen("foo", "r"); 31 ftell(p); // expected-warning {{Stream pointer might be NULL}} 32 fclose(p); 33 } 34 35 void f4(void) { 36 FILE *p = fopen("foo", "r"); 37 rewind(p); // expected-warning {{Stream pointer might be NULL}} 38 fclose(p); 39 } 40 41 void f5(void) { 42 FILE *p = fopen("foo", "r"); 43 if (!p) 44 return; 45 fseek(p, 1, SEEK_SET); // no-warning 46 fseek(p, 1, 3); // expected-warning {{The whence argument to fseek() should be SEEK_SET, SEEK_END, or SEEK_CUR}} 47 fclose(p); 48 } 49 50 void f6(void) { 51 FILE *p = fopen("foo", "r"); 52 fclose(p); 53 fclose(p); // expected-warning {{Try to close a file Descriptor already closed. Cause undefined behaviour}} 54 } 55 56 void f7(void) { 57 FILE *p = tmpfile(); 58 ftell(p); // expected-warning {{Stream pointer might be NULL}} 59 fclose(p); 60 } 61 62 void f8(int c) { 63 FILE *p = fopen("foo.c", "r"); 64 if(c) 65 return; // expected-warning {{Opened File never closed. Potential Resource leak}} 66 fclose(p); 67 } 68 69 FILE *f9(void) { 70 FILE *p = fopen("foo.c", "r"); 71 if (p) 72 return p; // no-warning 73 else 74 return 0; 75 } 76 77 void pr7831(FILE *fp) { 78 fclose(fp); // no-warning 79 } 80 81 // PR 8081 - null pointer crash when 'whence' is not an integer constant 82 void pr8081(FILE *stream, long offset, int whence) { 83 fseek(stream, offset, whence); 84 } 85 86
